JP6077640B2 - D2D connection recovery scheme - Google Patents
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Description
本発明は、Ｄ２Ｄ装置間の失われた接続の回復に関するＤ２Ｄ通信の態様に関する。 The present invention relates to aspects of D2D communication relating to the recovery of lost connections between D2D devices.
デバイスツーデバイス（Device−to−device；Ｄ２Ｄ）通信は、ＬＴＥ（ロングタームエボリューション）及び他のセルラー方式のネットワークの性能を向上する１つの手段である。Ｄ２Ｄ通信において、端末（ＬＴＥにおいて、ユーザ機器又はＵＥと呼ばれる）は、基地局（ＬＴＥにおいて、進化型ノードＢ（evolved node B）又はｅＮＢと呼ばれる）を通じてリンクされるのではなく、互いに直接通信する。複数のＤ２Ｄ装置間のＤ２Ｄ通信は、通常、Ｄ２Ｄ装置間の距離が短いことに起因して非常に局所的であり、したがって使用する送信パワーは非常に少なくなる。Ｄ２Ｄ通信はさらに、より高いスループットを目的としてセルラー方式のシステムにおいて空間リソースの再使用を拡大するための有力な方法でもある。本開示は、Ｄ２Ｄ装置間の失われた接続の回復に関するＤ２Ｄ通信の態様を扱う。 Device-to-device (D2D) communication is one means of improving the performance of LTE (Long Term Evolution) and other cellular networks. In D2D communication, terminals (referred to as user equipment or UE in LTE) communicate directly with each other rather than being linked through a base station (referred to as evolved node B or eNB in LTE). . D2D communication between multiple D2D devices is usually very local due to the short distance between D2D devices, and therefore uses very little transmission power. D2D communication is also a powerful method for expanding the reuse of spatial resources in cellular systems for higher throughput. The present disclosure addresses aspects of D2D communication related to the recovery of lost connections between D2D devices.
２つの装置間で確立されたＤ２Ｄ接続が失われることになった場合、これに対して、Ｄ２Ｄ接続を効率良く再確立して接続の確立に関連するオーバヘッドを回避するメカニズムを提供する。 In contrast, if a D2D connection established between two devices is to be lost, it provides a mechanism to efficiently re-establish the D2D connection and avoid the overhead associated with establishing the connection.
１つの実施形態において、ＬＴＥネットワークの中でユーザ機器（ＵＥ）として動作する装置が：ｅＮＢとの通信のため、及びＤ２Ｄ通信のため、エアインタフェースを提供する無線送受信部と；無線送受信部に接続されて、第２のＵＥとＤ２Ｄ通信セッションを確立し、上記第２のＵＥからのメッセージが、上記第２のＵＥがスリープ状態に入ることになり、起動時間が受信されたことを示す場合、肯定応答メッセージを上記第２のＵＥに送信し、上記の示された起動時間に、Ｄ２Ｄ回復メッセージを上記第２のＵＥに送信し、上記Ｄ２Ｄ回復メッセージに対する応答を待って上記Ｄ２Ｄ通信セッションを再確立する、処理回路と；を含む。 In one embodiment, an apparatus operating as a user equipment (UE) in an LTE network: a radio transceiver for providing an air interface for communication with an eNB and for D2D communication; connected to the radio transceiver If a D2D communication session is established with the second UE, and the message from the second UE indicates that the second UE will enter a sleep state and an activation time has been received, An acknowledgment message is sent to the second UE, and at the indicated startup time, a D2D recovery message is sent to the second UE, and a response to the D2D recovery message is awaited to re-establish the D2D communication session. Establishing a processing circuit;
下記説明及び図面は、具体的な実施形態を十分に例説して、当業者がこれらを実施することを可能にする。他の実施形態が、構造的、論理的、電気的、処理の及び他の変更を組み込むことができる。いくつかの実施形態の部分及び特徴が、他の実施形態の部分及び特徴に含まれ、あるいはこれらを代替することができる。請求項に明記される実施形態は、こうした請求項のすべての利用可能な均等物を包含する。 The following description and drawings sufficiently illustrate specific embodiments and enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, processing and other changes. Parts and features of some embodiments may be included or substituted for parts and features of other embodiments. Embodiments set forth in the claims encompass all available equivalents of those claims.
ＬＴＥネットワークに対する下層（underlay）としてのＤ２Ｄ通信は、集中型システム又は分散型システムとして実施することができる。後者の場合、Ｄ２Ｄ装置として動作するＵＥは、いかなるｅＮＢの関与も無しに、直接通信する。こうした分散型アーキテクチャは、Ｄ２Ｄ通信が帯域外であり、認可されたスペクトル以外のリソースを使用する場合に限り、適切である。Ｄ２Ｄ通信がＬＴＥセルラー方式通信と同一の認可された帯域において行われるとき、集中型システムが必要であり、これにおいて、ｅＮＢが無線リソースの制御を保つ。すなわち、ｅＮＢは、ＵＥ間でＤ２Ｄ通信が行われることを許し、Ｄ２Ｄリンクにおいて使用すべき時間周波数リソースを割り当てることに対して、責任を負う。 D2D communication as an underlay for the LTE network can be implemented as a centralized system or a distributed system. In the latter case, the UE operating as a D2D device communicates directly without any eNB involvement. Such a distributed architecture is appropriate only when D2D communication is out of band and uses resources other than the licensed spectrum. When D2D communication is performed in the same authorized band as LTE cellular communication, a centralized system is required, in which the eNB keeps control of radio resources. That is, the eNB is responsible for allowing D2D communication to be performed between UEs and allocating time-frequency resources to be used in the D2D link.
集中型Ｄ２Ｄシステム又は分散型Ｄ２Ｄシステムのいずれにおいても、２つのＵＥ装置間でＤ２Ｄリンクを最初に確立することに関連するオーバヘッドが存在する。２つの装置間で確立されたＤ２Ｄ接続が失われることになった場合、これに対して、Ｄ２Ｄ接続を効率良く再確立して接続の確立に関連するオーバヘッドを回避するメカニズムが存在することが望まれることになる。本明細書に説明されるものは、集中型の又は分散型のＤ２ＤシステムのためのＤ２Ｄ接続回復のためのスキームである。ｅＮＢに支援される（eNB−assisted）スキームもあれば、もっぱらＵＥにより実行されるスキームもある。 In either a centralized D2D system or a distributed D2D system, there is an overhead associated with first establishing a D2D link between two UE devices. In the event that a D2D connection established between two devices is to be lost, there should be a mechanism to efficiently re-establish the D2D connection and avoid the overhead associated with establishing the connection. Will be. Described herein is a scheme for D2D connection recovery for a centralized or distributed D2D system. Some schemes are eNB-assisted and others are executed exclusively by the UE.
システム説明
図１は、ＵＥ Ｄ１とＵＥ Ｄ２との例を示し、これらの各々は、１又は複数のアンテナ２３に接続された無線周波数（ＲＦ）送受信回路２２とインタフェースをとるプロセッサ２１を包含する。基地局又はｅＮＢ４０が、複数のアンテナ４３に接続されたＲＦ送受信回路４２とインタフェースをとるプロセッサ４１と共に示されている。図示されているコンポーネントは、ＬＴＥとＤ２Ｄ通信との双方に関してエアインタフェースを提供し、かつ本明細書に説明されるような処理機能を実行するための、任意の種類のハードウェア／ソフトウェア構成を提示することが意図される。図に示される実施形態において、ＵＥ Ｄ１とＵＥ Ｄ２とは、ＬＴＥリンクを介してｅＮＢ４０と通信もし、Ｄ２Ｄリンクを介して互いに通信もする。
System Description FIG. 1 shows an example of UE D1 and UE D2, each of which includes a
Ｄ２Ｄ接続回復スキーム
いくつかの実施形態において、Ｄ２Ｄ接続回復スキームは、確立されたＤ２Ｄ接続を有するＵＥがスリープ状態（すなわち、省電力モード）に入るような状況に適している。この場合におけるＤ２Ｄ接続回復は、ｅＮＢに支援されない（non−eNB assisted）スキーム又はｅＮＢに支援されるスキームとして実施することができる。
D2D Connection Recovery Scheme In some embodiments, the D2D connection recovery scheme is suitable for situations where a UE with an established D2D connection enters a sleep state (ie, a power saving mode). The D2D connection recovery in this case can be implemented as a non-eNB assisted scheme or an eNB assisted scheme.
ｅＮＢに支援されないＤ２Ｄ接続回復スキームの一例において、ＵＥ Ｄ１とＵＥ Ｄ２とが、確立されたＤ２Ｄ接続を有すると仮定する。Ｄ２が省電力モードに入ろうとするとき、Ｄ２は、もはやスリープモードではなくなるとき、Ｔwakeupを、ＵＥ Ｄ１に通知することができる。このＴwakeupは、スリープ状態の継続時間又は実際の起動時間に相当する。場合により、Ｄ２はさらに、アップリンク制御チャネルを用いてｅＮＢに送出することができる。Ｄ１は、スリープメッセージに肯定応答して、Ｄ２が起動するときにＤ１が利用可能であろうことを、Ｄ２に知らせることができる。Ｄ１から肯定応答メッセージを受信後、それからＤ２は自身のスリープ状態に入ることができ、ここで、この時点でスリープ状態に入ることは、Ｄ１から肯定応答を受信することを条件として行うことができる。Ｔsleepの時間の後、Ｄ２は、起動し、Ｄ２Ｄ回復要求をＤ１に送出する。それから、Ｄ１はＤ２Ｄ回復応答を用いて応答し、Ｄ２Ｄ接続が回復される。Ｄ２は、Ｄ２Ｄ接続回復をｅＮＢに通知してもよく、あるいは通知しなくてもよい。 In an example of a D2D connection recovery scheme not supported by eNB, assume that UE D1 and UE D2 have an established D2D connection. When D2 tries to enter the power saving mode, D2 can notify UE D1 of T wakeup when it is no longer in sleep mode. This T wakeup corresponds to the duration of the sleep state or the actual startup time. In some cases, D2 can be further sent to the eNB using an uplink control channel. D1 can acknowledge the sleep message to inform D2 that D1 will be available when D2 wakes up. After receiving an acknowledgment message from D1, D2 can then enter its own sleep state, where entering the sleep state at this point can be made subject to receiving an acknowledgment from D1. . After the time of T sleep , D2 starts up and sends a D2D recovery request to D1. D1 then responds with a D2D recovery response and the D2D connection is restored. D2 may or may not notify the eNB of D2D connection recovery.
Ｄ２Ｄ接続回復処理におけるｅＮＢの関与が少なければ少ないほど、ｅＮＢ動作に関連する制御オーバヘッドを理由として、効率性の観点で、より望ましくなる。しかしながら、いくつかの場合において、Ｄ２とＤ１とは、これら装置のうち一方がスリープ状態又はその他の非アクティブな状態に入る前に、取り決めを行うことができない。例えば、一方の装置が、異常な電源断を被る可能性がある。あるいは、スリープ状態通知を送出すること若しくは受信することにおいて、又は合意されたスリープ時間Ｔsleepを取り決めることにおいて失敗が生じる可能性がある。これら及び他の上記のような場合、ｅＮＢは、下記に説明されるように、Ｄ２Ｄ接続の回復を支援するように構成されることができる。Ｄ１とＤ２との間のＤ２Ｄ接続が失われたと仮定する。Ｄ１は、Ｄ２に対するＤ２Ｄ接続を回復したく、しかし、Ｄ２が起動することになるときに関して知識を有していない。Ｄ１は、Ｄ２Ｄ回復要求をｅＮＢに送出し、ｅＮＢは、Ｄ２のステータスをチェックする。Ｄ２がアイドルモードにいる場合、ｅＮＢは、Ｄ２についての次のページングサイクルの間、いつ再試行すればよいかを、Ｄ１に教えることになる。ページングサイクルの或る時点で、ｅＮＢは、Ｄ２に、Ｄ２Ｄ回復のために接続されたモードに入ることを知らせ、Ｄ１に、Ｄ２のアップリンク制御チャネルを監視し、計測することを求める。Ｄ１がｅＮＢに送信する測定レポートに基づいて、ｅＮＢは、Ｄ２Ｄ接続が回復されることができるかどうかを判断する。その答えがイエスである場合、ｅＮＢは、Ｄ２Ｄ接続回復を進めるように、Ｄ１とＤ２との双方に知らせる。 The less the eNB is involved in the D2D connection recovery process, the more desirable in terms of efficiency because of the control overhead associated with eNB operation. However, in some cases, D2 and D1 cannot make an agreement before one of these devices enters a sleep state or other inactive state. For example, one device may suffer an abnormal power loss. Alternatively, failure may occur in sending or receiving a sleep state notification or in negotiating the agreed sleep time T sleep . In these and other such cases, the eNB may be configured to assist in the recovery of the D2D connection, as described below. Assume that the D2D connection between D1 and D2 is lost. D1 wants to restore the D2D connection to D2, but has no knowledge about when D2 will be up. D1 sends a D2D recovery request to the eNB, and the eNB checks the status of D2. If D2 is in idle mode, the eNB will tell D1 when to retry during the next paging cycle for D2. At some point in the paging cycle, the eNB informs D2 to enter the connected mode for D2D recovery and asks D1 to monitor and measure D2's uplink control channel. Based on the measurement report that D1 sends to the eNB, the eNB determines whether the D2D connection can be restored. If the answer is yes, the eNB informs both D1 and D2 to proceed with D2D connection recovery.
別の実施形態において、Ｄ１がＤ２Ｄ接続を回復したく、しかしＤ２が起動することになるときについての知識が無い場合、Ｄ１は、Ｄ２Ｄ回復要求をｅＮＢに送出する。ｅＮＢがＤ２からＴwakeup通知をこれまでに受信していた場合、ｅＮＢはＴwakeupをＤ１に送出することになる。Ｄ１は、その時間に、Ｄ２とのＤ２Ｄ再接続の実行を試みることになる。ｅＮＢが上記のようなＴwakeupに関する情報を有していない場合、ｅＮＢはＤ１にＤ２のページング時間を知らせることができ、したがって、Ｄ１は、上記で説明されたように、Ｄ２のページングサイクルの間、Ｄ２Ｄ再接続を試みることができる。 In another embodiment, D1 sends a D2D recovery request to the eNB if D1 wants to recover the D2D connection but has no knowledge of when D2 will be up. If the eNB has received T wakeup notifications from D2 so far, the eNB will send T wakeup to D1. D1 will attempt to perform a D2D reconnection with D2 at that time. If the eNB does not have information about the T wakeup as described above, the eNB can inform D1 of D2's paging time, and thus D1 will be in the D2 paging cycle as explained above. D2D reconnection can be attempted.
別の実施形態において、Ｄ１がＤ２Ｄ回復要求をｅＮＢに送出するとき、ｅＮＢがＤ２からＴwakeup通知をこれまでに受信していた場合、ｅＮＢは、時間ＴwakeupとＤ２のページング時間との双方を用いてＤ１に応答することができる。Ｄ１は、Ｄ２Ｄ接続回復をいつ試行すべきかに関して、時間Ｔwakeupとページング時間との間で選択を行うことができる。例えば、ページング時間がＴwakeupより大分早い場合、Ｄ２Ｄ再接続がより急がれる、例えば、低いレイテンシが必要とされる場合に、前者が選択されることになる。Ｄ１は、選択されたＤ２Ｄ再接続時間に関して、パラメータＴreconnect_selectedを用いて、ｅＮＢに通知することができる。このＴreconnect_selectedは、ページング時間が選択されたか又はＴwakeupが選択されたかに関するインジケータである。Ｄ２Ｄ再接続のためにページングサイクル時間が使用される場合、ｅＮＢは、Ｄ１に、ページングサイクルの間、Ｄ２の送信電力調整に関して測定を行うように求めることができる。それから、ｅＮＢは、Ｄ１が要求したＤ２Ｄ再接続の指標と共に、Ｄ２をページングする（page）ことができる。Ｄ２が接続されたモードに入ると、Ｄ１とＤ２との双方は、そのＤ２Ｄ接続を回復する。 In another embodiment, when D1 sends a D2D recovery request to the eNB, if the eNB has previously received a T wakeup notification from D2, the eNB may determine both the time T wakeup and the paging time of D2. Can be used to respond to D1. D1 can make a choice between time T wakeup and paging time as to when D2D connection recovery should be attempted. For example, if the paging time is much earlier than T wakeup , the former will be selected when D2D reconnection is more urgent, for example, when low latency is required. D1 can inform the eNB about the selected D2D reconnection time using the parameter T reconnect_selected . This T reconnect_selected is an indicator as to whether a paging time has been selected or whether T wakeup has been selected. If the paging cycle time is used for D2D reconnection, the eNB may ask D1 to make measurements regarding the transmission power adjustment of D2 during the paging cycle. The eNB can then page D2 along with the D2D reconnection indication requested by D1. When D2 enters the connected mode, both D1 and D2 restore their D2D connection.
図２は、ｅＮＢ４０が関与しない、ＵＥ Ｄ１とＵＥ Ｄ２との間のＤ２Ｄ接続回復のための一例示的なスキームを示す。ステップ２０１において、Ｄ２Ｄ接続が、Ｄ１とＤ２との間で確立される。ステップ２０２において、Ｄ２は、自身がスリープ状態に入り、かつ時間Ｔwakeupに起動するであろうことを、Ｄ１に通知する。ステップ２０４において、Ｄ２はさらに、場合により、ｅＮＢに通知してもよい。ステップ２０５において、Ｄ１は、メッセージに肯定応答し、自身が時間Ｔwakeupに起動しているとＤ２に教える。ステップ２０６は、Ｄ１とＤ２との双方が時間Ｔwakeupに起動していることを示す。ステップ２０７において、Ｄ１は、Ｄ２Ｄ接続回復要求をＤ２に送出し、ステップ２０８において、Ｄ２はこの要求に応答する。（別法として、Ｄ２がＤ１に、Ｄ２Ｄ接続回復要求を送出することができる。）ステップ２０９において、Ｄ２Ｄ接続が回復される。
FIG. 2 shows an exemplary scheme for D2D connection recovery between UE D1 and UE D2 without
図３は、ｅＮＢ４０が関与する、ＵＥ Ｄ１とＵＥ Ｄ２との間のＤ２Ｄ接続回復のための一例示的なスキームを示す。ステップ３０１において、Ｄ２Ｄ接続が、Ｄ１とＤ２との間で確立される。ステップ３０２において、Ｄ２は、自身がスリープ状態に入り、かつ時間Ｔwakeupに起動するであろうことを、Ｄ１ではなくｅＮＢに通知する。ステップ３０３において、Ｄ１は、自身がＤ２とのＤ２Ｄ接続を再確立したいというＤ２Ｄ回復要求を用いて、ｅＮＢに通知する。ステップ３０４において、ｅＮＢは、Ｄ２の起動時間ＴwakeupをＤ１に送信する。それから、Ｄ１はスリープ状態に入ってもよく、入らなくてもよいが、ステップ３０５において、Ｄ１とＤ２との双方が起動している。ステップ３０６において、Ｄ１は、Ｄ２Ｄ接続回復要求をＤ２に送出し、ステップ３０７において、Ｄ２はこの要求に応答する。（別法として、Ｄ２がＤ１に、Ｄ２Ｄ接続回復要求を送出することができる。）ステップ３０８において、Ｄ２Ｄ接続が回復される。ステップ３０９において、場合により、Ｄ１又はＤ２のいずれかが、Ｄ２Ｄ接続が回復されたことをｅＮＢに通知してもよい。
FIG. 3 shows an exemplary scheme for D2D connection recovery between UE D1 and UE D2, where
図４は、ｅＮＢ４０が関与する、ＵＥ Ｄ１とＵＥ Ｄ２との間のＤ２Ｄ接続回復のための一例示的なスキームを示し、これにおいて、Ｄ２は、その起動時間をＤ１にもｅＮＢにも知らせること無くスリープ状態に入る。ステップ４０１において、Ｄ２Ｄ接続が、Ｄ１とＤ２との間で確立され、その後、Ｄ２は、Ｄ１にもｅＮＢにも知らせること無しにスリープ状態に入る。ステップ４０２において、Ｄ１は、自身がＤ２とのＤ２Ｄ接続を再確立したいというＤ２Ｄ回復要求をｅＮＢに送出する。応答において、ステップ４０３において、ｅＮＢは、Ｄ２についての次のページング時間をＤ１に送信する。ステップ４０４において、Ｄ１は、スリープ状態に入ってもよいが、Ｄ２についてのページング時間の前に起動する。ステップ４０５において、Ｄ１は、自身がＤ２とのＤ２Ｄ接続を再確立したいというＤ２Ｄ回復要求をｅＮＢに再度送出する。ステップ４０６において、ｅＮＢは、Ｄ１に、Ｄ２がＰＲＡＣＨ（物理ランダムアクセスチャネル）を通じてページ（page）に応答するとき又はアップリンク制御チャネル上で送信するときの、Ｄ２の送信を監視及び測定するように要求する。ステップ４０７において、Ｄ２を、ｅＮＢがページングする。ステップ４０８において、Ｄ２は、ＰＲＡＣＨを通じて、ネットワーク再エントリ手順を実行する。ステップ４０９において、Ｄ１は、Ｄ２の送信についての自身の測定レポートをｅＮＢに送出する。この測定レポートに基づいて、ｅＮＢが、Ｄ１とＤ２との間のチャネル品質がＤ２Ｄリンクをサポートするのに十分であるとみなす場合、ステップ４１０において、Ｄ２Ｄ回復許可がＤ１とＤ２との双方に送信される。ステップ４１１において、Ｄ１は、Ｄ２Ｄ接続回復要求をＤ２に送出し、ステップ４１２において、Ｄ２はこの要求に応答する。（別法として、Ｄ２がＤ１に、Ｄ２Ｄ接続回復要求を送出することができる。）ステップ４１３において、Ｄ２Ｄ接続が回復される。
FIG. 4 shows an exemplary scheme for D2D connection recovery between UE D1 and UE
図５は、ｅＮＢ４０が関与する、ＵＥ Ｄ１とＵＥ Ｄ２との間のＤ２Ｄ接続回復のための一例示的なスキームを示し、これにおいて、Ｄ２は、その起動時間をｅＮＢに知らせた後、スリープ状態に入る。ステップ５０１において、Ｄ２Ｄ接続が、Ｄ１とＤ２との間で確立され、その後、ステップ５０２において、Ｄ２は、その起動時間Ｔwakeupを、Ｄ１ではなくｅＮＢに知らせてスリープ状態に入る。ステップ５０３において、Ｄ１は、自身がＤ２とのＤ２Ｄ接続を再確立したいというＤ２Ｄ回復要求をｅＮＢに送出する。応答において、ステップ５０４において、ｅＮＢは、Ｄ２についての次のページング時間とＤ２の起動時間ＴwakeupとをＤ１に送信する。ステップ５０５において、Ｄ１は、Ｄ２のページング時間を選択し（このページング時間は時間Ｔwakeupより早いと仮定する）、ｅＮＢに通知する。Ｄ１は、Ｄ２のページング時間の前までに限りスリープ状態に入ってもよい。ステップ５０６において、Ｄ１は、自身がＤ２とのＤ２Ｄ接続を再確立したいというＤ２Ｄ回復要求をｅＮＢに再度送出する。ステップ５０７において、ｅＮＢは、Ｄ１に、Ｄ２がＰＲＡＣＨ（物理ランダムアクセスチャネル）を通じてページに応答するとき又はアップリンク制御チャネル上で送信するときの、Ｄ２の送信を監視及び測定するように要求する。ステップ５０８において、Ｄ２を、ｅＮＢがページングする。ステップ５０９において、Ｄ２は、ＰＲＡＣＨを通じて、ネットワーク再エントリ手順を実行し、ステップ５１０において、Ｄ１は、Ｄ２の送信についての自身の測定レポートをｅＮＢに送出する。この測定レポートに基づいて、ｅＮＢが、Ｄ１とＤ２との間のチャネル品質がＤ２Ｄリンクをサポートするのに十分であるとみなす場合、ステップ５１１において、Ｄ２Ｄ回復許可がＤ１とＤ２との双方に送信される。ステップ５１２において、Ｄ１は、Ｄ２Ｄ接続回復要求をＤ２に送出し、ステップ５１３において、Ｄ２はこの要求に応答する。（別法として、Ｄ２がＤ１に、Ｄ２Ｄ接続回復要求を送出することができる。）ステップ５１４において、Ｄ２Ｄ接続が回復される。
FIG. 5 shows an exemplary scheme for D2D connection recovery between UE D1 and UE
図６は、図５に図示されたスキームに類似した、ｅＮＢ４０が関与する、ＵＥ Ｄ１とＵＥ Ｄ２との間のＤ２Ｄ接続回復のための一例示的なスキームを示すが、これにおいて、Ｄ２とのＤ２Ｄリンクを再確立することに対して、Ｄ１は、起動時間の方がより早いかあるいは他の理由かのいずれかのため、Ｄ２のページング時間ではなくＤ２の起動時間を選択する。ステップ６０１において、Ｄ２Ｄ接続が、Ｄ１とＤ２との間で確立され、その後、ステップ６０２において、Ｄ２は、その起動時間Ｔwakeupを、Ｄ１ではなくｅＮＢに知らせてスリープ状態に入る。ステップ６０３において、Ｄ１は、自身がＤ２とのＤ２Ｄ接続を再確立したいというＤ２Ｄ回復要求をｅＮＢに送出する。応答において、ステップ６０４において、ｅＮＢは、Ｄ２についての次のページング時間とＤ２の起動時間ＴwakeupとをＤ１に送信する。ステップ６０５において、Ｄ１は、時間Ｔwakeupを選択し（ＴwakeupはＤ２のページング時間より早いと仮定する）、ｅＮＢに通知する。Ｄ１は、時間Ｔwakeupまでスリープ状態に入ってもよい。ステップ６０７において、Ｄ１は、Ｄ２Ｄ接続回復要求をＤ２に送信し、ステップ６０８において、Ｄ２は、この要求に応答する。（別法として、Ｄ２がＤ１に、Ｄ２Ｄ接続回復要求を送出することができる。）ステップ６０９において、Ｄ２Ｄ接続が回復される。
FIG. 6 shows an exemplary scheme for D2D connection recovery between UE D1 and UE D2, involving the
例示的な実施形態
１つの実施形態において、ＬＴＥネットワークの中でユーザ機器（ＵＥ）として動作する装置が：ｅＮＢとの通信のため、及びＤ２Ｄ通信のため、エアインタフェースを提供する無線送受信部と；無線送受信部に接続されて、第２のＵＥとＤ２Ｄ通信セッションを確立し、上記第２のＵＥからのメッセージが、上記第２のＵＥがスリープ状態に入ることになり、起動時間が受信されたことを示す場合、肯定応答メッセージを上記第２のＵＥに送信し、上記の示された起動時間に、Ｄ２Ｄ回復メッセージを上記第２のＵＥに送信し、上記Ｄ２Ｄ回復メッセージに対する応答を待って上記Ｄ２Ｄ通信セッションを再確立する、処理回路と；を含む。上記処理回路は、さらに：上記第２のＵＥがスリープ状態に入るが、上記起動時間を示すメッセージが上記第２のＵＥから受信されない場合、Ｄ２Ｄ回復要求を上記ｅＮＢに送信し；次のページング時間を示す、上記Ｄ２Ｄ回復要求に対する応答が、上記ｅＮＢから受信された場合、及び上記第２のＵＥが上記ページング時間にページに応答した場合、上記ページング時間にＤ２Ｄ回復メッセージを上記第２のＵＥに送信し、上記Ｄ２Ｄ回復メッセージに対する応答を待って上記Ｄ２Ｄ通信セッションを再確立することができる。上記処理回路は、さらに：上記第２のＵＥがスリープ状態に入るが、上記起動時間を示すメッセージが上記第２のＵＥから受信されない場合、Ｄ２Ｄ回復要求を上記ｅＮＢに送信し；上記第２のＵＥにより上記ｅＮＢにこれまでに送信された起動時間を示す、上記Ｄ２Ｄ回復要求に対する応答が、上記ｅＮＢから受信された場合、上記起動時間にＤ２Ｄ回復メッセージを上記第２のＵＥに送信し、上記Ｄ２Ｄ回復メッセージに対する応答を待って上記Ｄ２Ｄ通信セッションを再確立することができる。上記処理回路は、さらに：上記ｅＮＢによってそうするように要求された場合、物理ランダムアクセスチャネル（ＰＲＡＣＨ）を通じて上記ページに応答するときに上記第２のＵＥにより送信される信号を測定し、測定レポートを上記ｅＮＢに返信し；上記の返信された測定レポートに応答して上記ｅＮＢによってそうすることを許可された場合に限り、上記ページング時間にＤ２Ｄ回復メッセージを上記第２のＵＥに送信し、上記Ｄ２Ｄ回復メッセージに対する応答を待って上記Ｄ２Ｄ通信セッションを再確立することができる。上記処理回路は、さらに：上記ｅＮＢによってそうするように要求された場合、上記ページに応答した後にアップリンク制御チャネルを通じて上記第２のＵＥにより送信される信号を測定し、測定レポートを上記ｅＮＢに返信し；上記の返信された測定レポートに応答して上記ｅＮＢによってそうすることを許可された場合、上記ページング時間にＤ２Ｄ回復メッセージを上記第２のＵＥに送信し、上記Ｄ２Ｄ回復メッセージに対する応答を待って上記Ｄ２Ｄ通信セッションを再確立することができる。
Exemplary Embodiment In one embodiment, an apparatus operating as a user equipment (UE) in an LTE network: a radio transceiver that provides an air interface for communication with an eNB and for D2D communication; Connected to the radio transceiver unit to establish a D2D communication session with the second UE, and a message from the second UE has been received when the second UE enters the sleep state and the activation time is received If this is the case, send an acknowledgment message to the second UE, send a D2D recovery message to the second UE at the indicated startup time, and wait for a response to the D2D recovery message. Processing circuitry for re-establishing a D2D communication session. The processing circuit further: if the second UE enters a sleep state but a message indicating the activation time is not received from the second UE, sends a D2D recovery request to the eNB; next paging time And when a response to the D2D recovery request is received from the eNB and when the second UE responds to the page at the paging time, a D2D recovery message is sent to the second UE at the paging time. Transmit and wait for a response to the D2D recovery message to re-establish the D2D communication session. The processing circuit further: if the second UE enters a sleep state but a message indicating the activation time is not received from the second UE, sends a D2D recovery request to the eNB; If a response to the D2D recovery request is received from the eNB indicating the activation time transmitted to the eNB so far by the UE, a D2D recovery message is transmitted to the second UE at the activation time, and The D2D communication session can be reestablished after waiting for a response to the D2D recovery message. The processing circuit further: measures a signal transmitted by the second UE when responding to the page through a physical random access channel (PRACH), if requested to do so by the eNB, and reports a measurement report Send a D2D recovery message to the second UE at the paging time only if allowed to do so by the eNB in response to the returned measurement report, and The D2D communication session can be reestablished after waiting for a response to the D2D recovery message. The processing circuit further: measures the signal transmitted by the second UE through an uplink control channel after responding to the page, if requested to do so by the eNB, and sends a measurement report to the eNB Reply; if the eNB is allowed to do so in response to the returned measurement report, send a D2D recovery message to the second UE at the paging time and send a response to the D2D recovery message It is possible to wait and re-establish the D2D communication session.
別の実施形態において、ＬＴＥネットワークの中でユーザ機器（ＵＥ）として動作する装置が：ｅＮＢとの通信のため、及びＤ２Ｄ通信のため、エアインタフェースを提供する無線送受信部と；上記無線送受信部に接続されて、第１のＵＥとＤ２Ｄ通信セッションを確立し、スリープ状態が上記Ｄ２Ｄ通信セッションの確立の後に入力されることになる場合、上記第１のＵＥに、起動時間を示すメッセージを送信し、肯定応答メッセージが、上記第１のＵＥへの上記起動時間の送信に対する応答において、上記第１のＵＥから受信された場合、及び、Ｄ２Ｄ回復要求が、上記起動時間に上記第１のＵＥから受信された場合、上記Ｄ２Ｄ回復要求に応答して上記Ｄ２Ｄ通信セッションを再確立する、処理回路と：を含む。上記処理回路はさらに：スリープ状態が上記Ｄ２Ｄ通信セッションの確立の後に入力されることになる場合、上記ｅＮＢに、起動時間を示すメッセージを送信することができる。上記処理回路はさらに：上記第１のＵＥとの上記Ｄ２Ｄ通信セッションの再確立の後、上記ｅＮＢに、上記Ｄ２Ｄ通信セッションが再確立されたことを示すメッセージを送信することができる。 In another embodiment, an apparatus operating as a user equipment (UE) in an LTE network: a radio transceiver for providing an air interface for communication with an eNB and for D2D communication; If connected, establish a D2D communication session with the first UE, and if a sleep state is to be entered after the establishment of the D2D communication session, send a message indicating the activation time to the first UE An acknowledgment message is received from the first UE in response to the transmission of the activation time to the first UE, and a D2D recovery request is received from the first UE at the activation time. If received, processing circuitry for re-establishing the D2D communication session in response to the D2D recovery request. The processing circuit can further: if a sleep state is to be entered after the establishment of the D2D communication session, it can send a message indicating the activation time to the eNB. The processing circuit may further: after re-establishing the D2D communication session with the first UE, send a message to the eNB indicating that the D2D communication session has been re-established.
別の実施形態において、ＬＴＥネットワークの中でｅＮＢを動作させるための方法が：第１の及び第２のユーザ機器（ＵＥ）の間のデバイスツーデバイス（Ｄ２Ｄ）通信のため、上記第１のＵＥと上記第２のＵＥとから受信されたＤ２Ｄチャネル予約要求に応答して、時間周波数リソースを割り当てるステップと；上記第１のＵＥと上記第２のＵＥとの間のＤ２Ｄ通信セッションが確立され、上記第２のＵＥがスリープ状態に入った後、上記第２のＵＥについてのページング時間を上記第１のＵＥに送信することによって、上記第１のＵＥからのＤ２Ｄ回復要求に応答するステップと；を含む。上記方法は：上記第１のＵＥと上記第２のＵＥとの間のＤ２Ｄ通信セッションが確立され、上記第２のＵＥがスリープ状態に入り、起動時間を上記ｅＮＢに送信した後、上記第２のＵＥについての上記起動時間を上記第１のＵＥに送信することによって、上記第１のＵＥからのＤ２Ｄ回復要求に応答するステップ、をさらに含むことができる。上記方法は：上記第２のＵＥについての上記ページング時間を上記第１のＵＥに送信した後、上記ページング時間に、上記第２のＵＥに、ページを、上記第１のＵＥからの上記Ｄ２Ｄ回復要求の指標と共に送信するステップ、をさらに含むことができる。上記方法は：上記第１のＵＥからＤ２Ｄ回復要求を受信した後、物理ランダムアクセスチャネル（ＰＲＡＣＨ）を通じてページに応答して上記第２のＵＥにより送信される信号を測定するように上記第１のＵＥに要求する測定要求を送信するステップ、をさらに含むことができる。上記方法は：上記第１のＵＥからＤ２Ｄ回復要求を受信した後、アップリンク制御チャネルを通じてページに応答した後に上記第２のＵＥにより送信される信号を測定するように上記第１のＵＥに要求するステップ、をさらに含むことができる。上記方法は：上記測定要求に対する応答において上記第１のＵＥから測定レポートを受信した後、上記の測定された信号が十分であるかどうかを判定し、Ｄ２Ｄ回復許可を上記第１のＵＥ及び上記第２のＵＥに送信するステップ、をさらに含むことができる。 In another embodiment, a method for operating an eNB in an LTE network is: for device-to-device (D2D) communication between a first and second user equipment (UE), the first UE Allocating time frequency resources in response to D2D channel reservation requests received from the second UE; and establishing a D2D communication session between the first UE and the second UE; Responding to a D2D recovery request from the first UE by transmitting a paging time for the second UE to the first UE after the second UE enters a sleep state; including. The method includes: after a D2D communication session is established between the first UE and the second UE, the second UE enters a sleep state, transmits an activation time to the eNB, and then the second Responding to the D2D recovery request from the first UE by transmitting the activation time for the first UE to the first UE. The method is: after transmitting the paging time for the second UE to the first UE, then to page to the second UE, to the second UE, to the D2D recovery from the first UE Further transmitting with the request indication. The method includes: after receiving a D2D recovery request from the first UE, measuring the signal transmitted by the second UE in response to a page through a physical random access channel (PRACH). The method may further include transmitting a measurement request to the UE. The method includes: after receiving a D2D recovery request from the first UE, requesting the first UE to measure a signal transmitted by the second UE after responding to a page through an uplink control channel Further comprising the step of: The method includes: after receiving a measurement report from the first UE in response to the measurement request, determining whether the measured signal is sufficient and granting D2D recovery permission to the first UE and the Transmitting to the second UE may further be included.
別の実施形態において、ＬＴＥネットワークの中でＵＥを動作させるための方法が：Ｄ２Ｄ通信セッションを第２のＵＥと確立するステップと；上記第２のＵＥから、上記第２のＵＥがスリープ状態に入ることになることを示すメッセージが受信された場合、上記第２のＵＥが上記スリープ状態から起動する起動時間を取り決めるステップと；Ｄ２Ｄ回復メッセージを上記第２のＵＥに送信し、上記Ｄ２Ｄ回復メッセージに対する応答を待って上記Ｄ２Ｄ通信セッションを再確立するステップと；を含む。上記方法は：上記第２のＵＥがスリープ状態に入るが、上記起動時間を示すメッセージが上記第２のＵＥから受信されない場合、Ｄ２Ｄ回復要求をｅＮＢに送信するステップと；次のページング時間を示す、上記Ｄ２Ｄ回復要求に対する応答が、上記ｅＮＢから受信された場合、及び上記第２のＵＥが上記ページング時間にページに応答した場合、上記ページング時間にＤ２Ｄ回復メッセージを上記第２のＵＥに送信し、上記Ｄ２Ｄ回復メッセージに対する応答を待って上記Ｄ２Ｄ通信セッションを再確立するステップと；をさらに含むことができる。上記方法は：上記第２のＵＥがスリープ状態に入るが、上記起動時間を示すメッセージが上記第２のＵＥから受信されない場合、Ｄ２Ｄ回復要求をｅＮＢに送信するステップと；上記第２のＵＥにより上記ｅＮＢにこれまでに送信された起動時間を示す、上記Ｄ２Ｄ回復要求に対する応答が、上記ｅＮＢから受信された場合、上記起動時間にＤ２Ｄ回復メッセージを上記第２のＵＥに送信し、上記Ｄ２Ｄ回復メッセージに対する応答を待って上記Ｄ２Ｄ通信セッションを再確立するステップと；をさらに含むことができる。上記方法は：上記ｅＮＢによってそうするように要求された場合、物理ランダムアクセスチャネル（ＰＲＡＣＨ）を通じて上記ページに応答するときに上記第２のＵＥにより送信される信号を測定し、測定レポートを上記ｅＮＢに返信するステップと；上記の返信された測定レポートに応答して上記ｅＮＢによってそうすることを許可された場合に限り、上記ページング時間にＤ２Ｄ回復メッセージを上記第２のＵＥに送信し、上記Ｄ２Ｄ回復メッセージに対する応答を待って上記Ｄ２Ｄ通信セッションを再確立するステップと；をさらに含むことができる。上記方法は：上記ｅＮＢによってそうするように要求された場合、上記ページに応答した後にアップリンク制御チャネルを通じて上記第２のＵＥにより送信される信号を測定し、測定レポートを上記ｅＮＢに返信するステップと；上記の返信された測定レポートに応答して上記ｅＮＢによってそうすることを許可された場合、上記ページング時間にＤ２Ｄ回復メッセージを上記第２のＵＥに送信し、上記Ｄ２Ｄ回復メッセージに対する応答を待って上記Ｄ２Ｄ通信セッションを再確立するステップと；をさらに含むことができる。上記方法は：第１のＵＥとＤ２Ｄ通信セッションを確立するステップと；スリープ状態が上記Ｄ２Ｄ通信セッションの確立の後に入力されることになる場合、上記第１のＵＥに、起動時間を示すメッセージを送信するステップと；肯定応答メッセージが、上記第１のＵＥへの上記起動時間の送信に対する応答において、上記第１のＵＥから受信された場合、及び、Ｄ２Ｄ回復要求が、上記起動時間に上記第１のＵＥから受信された場合、上記Ｄ２Ｄ回復要求に応答して上記Ｄ２Ｄ通信セッションを再確立するステップと；をさらに含むことができる。 In another embodiment, a method for operating a UE in an LTE network includes: establishing a D2D communication session with a second UE; from the second UE, the second UE goes to sleep If a message is received indicating that the second UE is to enter, deciding an activation time for the second UE to wake up from the sleep state; sending a D2D recovery message to the second UE, and the D2D recovery message Waiting for a response to re-establishing the D2D communication session. The method includes: sending a D2D recovery request to the eNB if the second UE enters a sleep state but no message indicating the activation time is received from the second UE; indicating a next paging time; When a response to the D2D recovery request is received from the eNB, and when the second UE responds to the page at the paging time, a D2D recovery message is transmitted to the second UE at the paging time. And re-establishing the D2D communication session after waiting for a response to the D2D recovery message. The method includes: sending a D2D recovery request to the eNB if the second UE enters a sleep state but a message indicating the activation time is not received from the second UE; and by the second UE When a response to the D2D recovery request is received from the eNB indicating the activation time transmitted so far to the eNB, a D2D recovery message is transmitted to the second UE at the activation time, and the D2D recovery is performed. Waiting for a response to the message and re-establishing the D2D communication session. The method: if requested to do so by the eNB, measure the signal transmitted by the second UE when responding to the page through a physical random access channel (PRACH) and send a measurement report to the eNB Sending a D2D recovery message to the second UE at the paging time only if allowed to do so by the eNB in response to the returned measurement report, and the D2D Re-establishing the D2D communication session after waiting for a response to the recovery message. The method includes: when requested to do so by the eNB, measuring a signal transmitted by the second UE through an uplink control channel after responding to the page, and returning a measurement report to the eNB And if the eNB is allowed to do so in response to the returned measurement report, send a D2D recovery message to the second UE at the paging time and wait for a response to the D2D recovery message Re-establishing the D2D communication session. The method includes: establishing a D2D communication session with a first UE; and if a sleep state is to be entered after establishing the D2D communication session, a message indicating an activation time is sent to the first UE. Transmitting; an acknowledgment message is received from the first UE in response to the transmission of the activation time to the first UE, and a D2D recovery request is sent to the first UE at the activation time. Re-establishing the D2D communication session in response to the D2D recovery request when received from one UE.
上記で説明された実施形態は、オペレーションのための方法として、及び／又はこの方法を実行する命令を実行するプロセッサを含み得る種々のハードウェア構成において、実施することができる。上記のような命令は、適切な記憶媒体に含むことができ、この記憶媒体から、メモリ又は他のプロセッサ実行可能媒体にこれら命令が転送される。 The embodiments described above can be implemented as a method for operation and / or in various hardware configurations that can include a processor executing instructions to perform the method. Such instructions may be included in any suitable storage medium from which the instructions are transferred to a memory or other processor executable medium.
本主題は、ＬＴＥネットワークという文脈において説明されている。矛盾が生じることになる場合を除き、本主題は、ＵＥとｅＮＢとをそれぞれ端末と基地局とに置換して参照して、他の種類のセルラー方式ネットワークにおいて使用することができる。 The present subject matter is described in the context of LTE networks. Except where inconsistencies arise, the present subject matter can be used in other types of cellular networks, referring to the UE and eNB replaced by a terminal and a base station, respectively.
本主題は、前述の具体的な実施形態と関連して説明されている。これらの実施形態は、有益であると考えられる任意の方法でさらに組み合わせることもできることを、認識されたい。さらに、多くの代替、変形及び変更が、当業者に明らかになるであろう。他のこのような代替、変形及び変更は、下記の添付された請求項の範囲に入ることが意図される。 The present subject matter has been described in connection with the specific embodiments described above. It will be appreciated that these embodiments can be further combined in any way deemed beneficial. In addition, many alternatives, modifications, and variations will be apparent to those skilled in the art. Other such alternatives, modifications and variations are intended to fall within the scope of the appended claims below.
要約書は、読み手が技術的開示の本質及び要点を確かめることを可能にする要約を義務付ける３７Ｃ.Ｆ.Ｒ.セクション１．７２（ｂ）に従うように提供される。要約書は、これ自体が請求項の範囲又は意味を限定し又は解釈するために使用されるものではないとの理解とともに、提示される。下記の請求項はこれにより詳細な説明に包含され、各請求項はそれ自体を別個の実施形態として主張する。 A summary is provided to follow 37CRFR section 1.72 (b), which requires a summary that allows the reader to ascertain the nature and gist of the technical disclosure. The Abstract is presented with the understanding that it will not be used in itself to limit or interpret the scope or meaning of the claims. The following claims are hereby incorporated into the Detailed Description, with each claim standing on its own as a separate embodiment.
関連出願
本出願は、２０１３年１月２８日に申請された米国特許出願番号第１３／７５１，２５２号に対して優先の利益を主張するものであり、上記米国特許出願は、２０１２年４月１３日に申請された米国特許仮出願番号第６１／６２４，１８５に対して優先の利益を主張するものであり、これら米国出願は双方ともその全体を本明細書において参照により援用される。
RELATED APPLICATION This application claims priority benefit over US patent application Ser. No. 13 / 751,252 filed Jan. 28, 2013, which is filed in April 2012. No. 61 / 624,185 filed on the 13th, which claims priority benefit, both of which are hereby incorporated by reference in their entirety.
Claims (20)
ｅＮＢ（進化型ノードＢ）との通信のため、及びＤ２Ｄ（デバイスツーデバイス）通信のため、エアインタフェースを提供する無線送受信部と、
前記無線送受信部に接続されて、
第２のＵＥとＤ２Ｄ通信セッションを確立し、
前記第２のＵＥからのメッセージが、前記第２のＵＥがスリープ状態に入ることになり、起動時間が受信されたことを示す場合、肯定応答メッセージを前記第２のＵＥに送信し、前記の示された起動時間に、Ｄ２Ｄ回復メッセージを前記第２のＵＥに送信し、前記Ｄ２Ｄ回復メッセージに対する応答を待って前記Ｄ２Ｄ通信セッションを再確立し、
前記第２のＵＥとの前記Ｄ２Ｄ通信セッションが失われたが、前記起動時間を示すメッセージが前記第２のＵＥから受信されない場合、Ｄ２Ｄ回復要求を前記ｅＮＢに送信し、
次のページング時間を示す、前記Ｄ２Ｄ回復要求に対する応答が、前記ｅＮＢから受信された場合、Ｄ２Ｄ回復メッセージを前記第２のＵＥに送信し、前記Ｄ２Ｄ回復メッセージに対する応答を待って前記Ｄ２Ｄ通信セッションを再確立する、
処理回路と、
を含む装置。 A user equipment (UE) device,
a radio transceiver for providing an air interface for communication with an eNB (evolved Node B) and for D2D (device to device) communication;
Connected to the wireless transceiver,
Establish a D2D communication session with the second UE;
If the message from the second UE indicates that the second UE is going to sleep and an activation time has been received, send an acknowledgment message to the second UE; At the indicated startup time, send a D2D recovery message to the second UE, wait for a response to the D2D recovery message, and re-establish the D2D communication session;
If the D2D communication session with the second UE is lost, but a message indicating the activation time is not received from the second UE, a D2D recovery request is transmitted to the eNB,
Shows the next paging time, in response to said D2D recovery request, if received from the eNB, and transmits the D 2D recovery message to the second UE, the D2D communication waiting a response to the D2D recovery message Re-establish the session,
A processing circuit;
Including the device.
前記第２のＵＥとの前記Ｄ２Ｄ通信セッションの再確立の後、前記ｅＮＢに、前記Ｄ２Ｄ通信セッションが再確立されたことを示すメッセージを送信する、
請求項１に記載の装置。 The processing circuit further includes:
After re-establishing the D2D communication session with the second UE, sending a message to the eNB indicating that the D2D communication session has been re-established;
The apparatus of claim 1.
前記第２のＵＥとの前記Ｄ２Ｄ通信セッションが失われたが、前記起動時間を示すメッセージが前記第２のＵＥから受信されない場合、Ｄ２Ｄ回復要求を前記ｅＮＢに送信し、
前記第２のＵＥにより前記ｅＮＢにこれまでに送信された起動時間を示す、前記Ｄ２Ｄ回復要求に対する応答が、前記ｅＮＢから受信された場合、前記起動時間にＤ２Ｄ回復メッセージを前記第２のＵＥに送信し、前記Ｄ２Ｄ回復メッセージに対する応答を待って前記Ｄ２Ｄ通信セッションを再確立する、
請求項１に記載の装置。 The processing circuit further includes:
If the D2D communication session with the second UE is lost, but a message indicating the activation time is not received from the second UE, a D2D recovery request is transmitted to the eNB,
If a response to the D2D recovery request is received from the eNB indicating the activation time transmitted to the eNB so far by the second UE, a D2D recovery message is transmitted to the second UE at the activation time. Send and wait for a response to the D2D recovery message to re-establish the D2D communication session;
The apparatus of claim 1.
前記ｅＮＢによってそうするように要求された場合、物理ランダムアクセスチャネル（ＰＲＡＣＨ）を通じてページに応答するときに前記第２のＵＥにより送信される信号を測定し、測定レポートを前記ｅＮＢに返信し、
前記の返信された測定レポートに応答して前記ｅＮＢによってそうすることを許可された場合、Ｄ２Ｄ回復メッセージを前記第２のＵＥに送信し、前記Ｄ２Ｄ回復メッセージに対する応答を待って前記Ｄ２Ｄ通信セッションを再確立する、
請求項１に記載の装置。 The processing circuit further includes:
Wherein when it is requested to do so by eNB, by measuring the signal transmitted by the second UE when responding to page through a Physical Random Access Channel (PRACH), returns a measurement report to the eNB And
If allowed to do so by the eNB in response to the returned measurement report, send a D 2D recovery message to the second UE and wait for a response to the D2D recovery message before the D2D communication session Re-establish the
The apparatus of claim 1.
前記ｅＮＢによってそうするように要求された場合、ページに応答した後にアップリンク制御チャネルを通じて前記第２のＵＥにより送信される信号を測定し、測定レポートを前記ｅＮＢに返信し、
前記の返信された測定レポートに応答して前記ｅＮＢによってそうすることを許可された場合、Ｄ２Ｄ回復メッセージを前記第２のＵＥに送信し、前記Ｄ２Ｄ回復メッセージに対する応答を待って前記Ｄ２Ｄ通信セッションを再確立する、
請求項１に記載の装置。 The processing circuit further includes:
Wherein when it is requested to do so by eNB, by measuring the signal transmitted by the second UE through the uplink control channel after responding to pages, and returns a measurement report to the eNB,
If allowed to do so by the eNB in response to the returned measurement report, send a D 2D recovery message to the second UE and wait for a response to the D2D recovery message before the D2D communication session Re-establish the
The apparatus of claim 1.
ｅＮＢ（進化型ノードＢ）との通信のため、及びＤ２Ｄ（デバイスツーデバイス）通信のため、エアインタフェースを提供する無線送受信部と、
前記無線送受信部に接続されて、
第２のＵＥとＤ２Ｄ通信セッションを確立し、
前記第２のＵＥからのメッセージが、前記第２のＵＥがスリープ状態に入ることになり、起動時間が受信されたことを示す場合、肯定応答メッセージを前記第２のＵＥに送信し、前記の示された起動時間に、Ｄ２Ｄ回復メッセージを前記第２のＵＥに送信し、前記Ｄ２Ｄ回復メッセージに対する応答を待って前記Ｄ２Ｄ通信セッションを再確立し、
前記第２のＵＥとの前記Ｄ２Ｄ通信セッションが失われたが、前記起動時間を示すメッセージが前記第２のＵＥから受信されない場合、Ｄ２Ｄ回復要求を前記ｅＮＢに送信し、
前記第２のＵＥにより前記ｅＮＢにこれまでに送信された起動時間を示す、前記Ｄ２Ｄ回復要求に対する応答が、前記ｅＮＢから受信された場合、前記起動時間にＤ２Ｄ回復メッセージを前記第２のＵＥに送信し、前記Ｄ２Ｄ回復メッセージに対する応答を待って前記Ｄ２Ｄ通信セッションを再確立する、
処理回路と、
を含む装置。 A user equipment (UE) device,
a radio transceiver for providing an air interface for communication with an eNB (evolved Node B) and for D2D (device to device) communication;
Connected to the wireless transceiver,
Establish a D2D communication session with the second UE;
If the message from the second UE indicates that the second UE is going to sleep and an activation time has been received, send an acknowledgment message to the second UE; At the indicated startup time, send a D2D recovery message to the second UE, wait for a response to the D2D recovery message, and re-establish the D2D communication session;
If the D2D communication session with the second UE is lost, but a message indicating the activation time is not received from the second UE, a D2D recovery request is transmitted to the eNB,
If a response to the D2D recovery request is received from the eNB indicating the activation time transmitted to the eNB so far by the second UE, a D2D recovery message is transmitted to the second UE at the activation time. Send and wait for a response to the D2D recovery message to re-establish the D2D communication session;
A processing circuit;
Including the device.
第２のＵＥとＤ２Ｄ（デバイスツーデバイス）通信セッションを確立するステップと、
前記第２のＵＥがスリープ状態に入ることになることを示す、前記第２のＵＥからのメッセージが受信された場合、前記第２のＵＥが前記スリープ状態から起動する起動時間を取り決めるステップと、
前記起動時間に、Ｄ２Ｄ回復メッセージを前記第２のＵＥに送信し、前記Ｄ２Ｄ回復メッセージに対する応答を待って前記Ｄ２Ｄ通信セッションを再確立するステップと、
前記第２のＵＥとの前記Ｄ２Ｄ通信セッションが失われたが、前記起動時間を示すメッセージが前記第２のＵＥから受信されない場合、Ｄ２Ｄ回復要求を前記ｅＮＢに送信するステップと、
前記第２のＵＥにより前記ｅＮＢにこれまでに送信された起動時間を示す、前記Ｄ２Ｄ回復要求に対する応答が、前記ｅＮＢから受信された場合、前記起動時間にＤ２Ｄ回復メッセージを前記第２のＵＥに送信し、前記Ｄ２Ｄ回復メッセージに対する応答を待って前記Ｄ２Ｄ通信セッションを再確立するステップと、
を含む方法。 A method for operating a user equipment (UE) comprising:
Establishing a D2D (device-to-device) communication session with a second UE;
Negotiating an activation time for the second UE to wake from the sleep state if a message from the second UE is received indicating that the second UE will enter a sleep state; and
Sending a D2D recovery message to the second UE at the startup time and waiting for a response to the D2D recovery message to re-establish the D2D communication session;
If the D2D communication session with the second UE is lost, but a message indicating the activation time is not received from the second UE, a step of transmitting a D2D recovery request to the eNB;
If a response to the D2D recovery request is received from the eNB indicating the activation time transmitted to the eNB so far by the second UE, a D2D recovery message is transmitted to the second UE at the activation time. Transmitting and waiting for a response to the D2D recovery message to re-establish the D2D communication session;
Including methods.
デバイスツーデバイス（Ｄ２Ｄ）通信セッションを第２のＵＥと確立するステップと、
前記第２のＵＥから、前記第２のＵＥがスリープ状態に入ることになることを示すメッセージが受信された場合、前記第２のＵＥが前記スリープ状態から起動する起動時間を取り決めるステップと、
前記起動時間に、Ｄ２Ｄ回復メッセージを前記第２のＵＥに送信し、前記Ｄ２Ｄ回復メッセージに対する応答を待って前記Ｄ２Ｄ通信セッションを再確立するステップと、
前記第２のＵＥとの前記Ｄ２Ｄ通信セッションが失われたが、前記起動時間を示すメッセージが前記第２のＵＥから受信されない場合、Ｄ２Ｄ回復要求を前記ｅＮＢに送信するステップと、
次のページング時間を示す、前記Ｄ２Ｄ回復要求に対する応答が、前記ｅＮＢから受信された場合、Ｄ２Ｄ回復メッセージを前記第２のＵＥに送信し、前記Ｄ２Ｄ回復メッセージに対する応答を待って前記Ｄ２Ｄ通信セッションを再確立するステップと、
を含む方法。 A method for operating a user equipment (UE) comprising:
Establishing a device-to-device (D2D) communication session with a second UE;
If a message is received from the second UE indicating that the second UE will enter a sleep state, negotiating an activation time for the second UE to wake up from the sleep state;
Sending a D2D recovery message to the second UE at the startup time and waiting for a response to the D2D recovery message to re-establish the D2D communication session;
If the D2D communication session with the second UE is lost, but a message indicating the activation time is not received from the second UE, a step of transmitting a D2D recovery request to the eNB;
When a response to the D2D recovery request is received from the eNB indicating a next paging time, a D 2D recovery message is transmitted to the second UE, and a response to the D2D recovery message is waited for. Re-establishing
Including methods.
前記第２のＵＥにより前記ｅＮＢにこれまでに送信された起動時間を示す、前記Ｄ２Ｄ回復要求に対する応答が、前記ｅＮＢから受信された場合、前記起動時間にＤ２Ｄ回復メッセージを前記第２のＵＥに送信し、前記Ｄ２Ｄ回復メッセージに対する応答を待って前記Ｄ２Ｄ通信セッションを再確立するステップと、
をさらに含む請求項１５に記載の方法。 If the D2D communication session with the second UE is lost, but the message indicating the activation time is not received from the second UE, sending a D2D recovery request to the eNB;
If a response to the D2D recovery request is received from the eNB indicating the activation time transmitted to the eNB so far by the second UE, a D2D recovery message is transmitted to the second UE at the activation time. Transmitting and waiting for a response to the D2D recovery message to re-establish the D2D communication session;
16. The method of claim 15, further comprising:
前記の返信された測定レポートに応答して前記ｅＮＢによってそうすることを許可された場合、Ｄ２Ｄ回復メッセージを前記第２のＵＥに送信し、前記Ｄ２Ｄ回復メッセージに対する応答を待って前記Ｄ２Ｄ通信セッションを再確立するステップと、
をさらに含む請求項１６に記載の方法。 Wherein when it is requested to do so by eNB, by measuring the signal transmitted by the second UE when responding to page through a Physical Random Access Channel (PRACH), returns a measurement report to the eNB And steps to
If allowed to do so by the eNB in response to the returned measurement report, send a D 2D recovery message to the second UE and wait for a response to the D2D recovery message before the D2D communication session Re-establishing
The method of claim 16 further comprising:
前記の返信された測定レポートに応答して前記ｅＮＢによってそうすることを許可された場合、Ｄ２Ｄ回復メッセージを前記第２のＵＥに送信し、前記Ｄ２Ｄ回復メッセージに対する応答を待って前記Ｄ２Ｄ通信セッションを再確立するステップと、
をさらに含む請求項１６に記載の方法。 Wherein when it is requested to do so by eNB, a step of measuring the signal transmitted by the second UE through the uplink control channel after responding to pages and returns a measurement report to the eNB,
If allowed to do so by the eNB in response to the returned measurement report, send a D 2D recovery message to the second UE and wait for a response to the D2D recovery message before the D2D communication session Re-establishing
The method of claim 16 further comprising:
肯定応答メッセージが、前記第２のＵＥへの前記起動時間の送信に応答して、前記第２のＵＥから受信された場合、及び、Ｄ２Ｄ回復メッセージが、前記起動時間に前記第２のＵＥから受信された場合、前記Ｄ２Ｄ回復メッセージに応答して前記Ｄ２Ｄ通信セッションを再確立するステップと、
をさらに含む請求項１５に記載の方法。 If a sleep state is to be entered after establishment of the D2D communication session with the second UE, sending a message indicating an activation time to the second UE;
Acknowledgment message, it responds to the transmission of the start time to the second UE, when it is received from the second UE, and, D2D recovery message, the second UE to said activation time Re-establishing the D2D communication session in response to the D2D recovery message ,
16. The method of claim 15, further comprising:
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